Apparatus for feeding scale-preventives into boilers.



No. 838,217 PATENTED DEC. 11, 1906. B. O. SGHWINGEL & R. W. TURNER. APPARATUS FDR FEEDING SCALE PREVBNTIVES INTO BOILERS.

APPLICATION FILED MAR. 22,1906.

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UNITED STATES T OFFICE.

EDWARD C. SOHWINGEL, OF BUFFALO, AND RALPH W. TURNER, OF EAST AURORA, NEW YORK; SAID TURNER ASSIGNOR TO LAKE ERIE BOILER OOMPOUN D COMPANY, OF BUFFALO, NEW YORK.

APPARATUS FOR FEEDING SCALE-PREVENTIVES INTO BOILERS.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application filed March 22', 1906. Serial No. 307.372.

To u-Z/ whom it may concern:

Be it known that we, EDWARD O. SoHwrN- GEL, residing at Buffalo, and RALPH WV. TURNER, residing at East Aurora, in the county of Erie and State of New York, citi- Zens of the United States, have invented a new and useful Improvement in Apparatus for Feeding Scale-Preventives into Boilers, of which the following is a specification.

This invention relates more particularly to apparatus for feeding liquid scale-preventive compounds into the feed-water of boilers, in which the scale-preventive is fed from the receptacle containing it into a chamber or passage connected to the pressure and suction sides of the boiler-feed pump and through which a portion of the feed-water is passed to take up and carry the scalepre ventive along with it to the boiler. An apparatus for this purpose is known in which the scale-preventive holder is connected to and discharges the compound into an injector which is connected to the pressure and suction sides of the boiler-feed pump, a sight tube or chamber being provided between the receptacle and injector, through which the scale-preventive passes. The feeding of the compound can be observed in this apparatus; but the mixingchamber or injector is hidden from view and it is not possible to determine whether or not the quantity of water and compound are properly proportioned to give the best results, and the compound frequently backs up in the sightchamber and obstructs the view.

The primary object of this invention is to improve such apparatus by so constructing and arranging the parts that the feeding of both the scale-preventive and water and the mixing thereof in the mixing-chamber can be observed at all times and nicely regulated to control the amount of the compound fed to the boiler and prevent the waste thereof.

Another object is to provide an el'licient and desirable apparatus for the purpose stated of exceedingly simple, practical, and inexpensive construction. To this end the mixing-chamber of the apparatus, or that chamber with which the scale-preventive holder and the pipes from the pressure and suction sides of the pump are connected, is

provided with a glass or transparent side or sides through which the entrance and dising shoulders and rings.

charge of both the compound and water can be seen, and valves are provided in the pump and compound-holder connections for properly regulating and proportioning the flow of the scale-preventive and the Water.

In the accompanying drawings, Figure 1 is a front elevation, partly in section, of an apparatus for feeding scale-preventives embodying the invention. Fig. 2 is a sectional elevation, on an enlarged scale, of the mixingchamber and connections. Fig. .3 is a transverrse section of the mixing-chamber in line 3 3 i 2.

Like letters of reference refer to like parts in the several figures.

A represents an ordinary feed-water pump for a boiler, a the suction or supply pipe leading to the pump, and a the pressure-pipe leading from the pump to the boiler or other receiver which is fed by the pump.

B represents a receptacle, tank, or holder of any usual or suitable form for the scalepreventive liquid or compound. The receptacle is preferably covered and provided with a strainer Z) near its bottom to prevent the discharge with the scale-preventive of any solid impurities contained therein.

O represents a discharge-pipe leading from the bottom of the receptacle B, and D and E represent branch pipes connecting, respectively, with the pressure and suction pipes a and a of the feed-water pump. The pipes are joined by a mixing and sight feed chamber F, the feed-pipe O for the scale-prevent ive connecting with the top of said mixingchamber for discharging the scale-preventive thereinto, while the pipes D and E connect with the mixing-chamber at opposite sides in line with each other.

In the construction shown in the drawings the mixing-chamber consists of a cylindrical body f, having bosses at the top and opposite sides for connection with the pipes O, D, and E, and glass or transparent ends or panes j", which aiiord a view of the entire interior of the mixing-chamber from either end thereof. The glass end wallsf are firmly secured in the ends of the body against internal shoulders f by threaded rings f screwed into the internally-threaded ends of the body, suitable packing-rings f being interposed between the glass panes and the secur- Any other suitable construction for the mixing and sight chamber could be employed. It is not necessary to have glass panes at both-ends of the mixing-chamber; but this construction is most desirable, as the mixing-chamber can then be connected up with either end in the most accessible position to afford a view of the interi or of the chamber.

- The scale-preventive feed-pipe C preferably has a discharge-nozzle g, depending into the mixing-chamber and is provided with a regulating-valve (preferably an ordinary screw needle-valve) h for regulating the discharge of the scale-preventive, so as to cause it to flow drop by drop or in a fine stream into the mixing-chamber. The suction-pipe E communicates with the lower part of the mixing-chamber by a relatively large unobstructed passage i at one side; but the pressure-pipe has a small nozzle k entering the opposite side of the mixing-chamber directly opposite the center of the large suction-passage i, so as to direct a stream of water across the mixing-chamber into said suction-pas sage without striking the body-wall of the chamber and splashing the liquid over the body and glass ends thereof.

The pressure and suction pipes D and E are provided with suitablevalves for regulating the flow therethrough. The pipes in the construction shown have ordinary globevalves L and L for this purpose, and a screw needle-valve M is also preferably provided for controlling the. nozzle of the pressurepipe.

In operation when the pump is in action and the valves L, L, and M are opened the pump will circulate a portion of the feedwater through the pressure-pipe D, mixingchamber F, and suction-pipe E, the water passing from the pressure-nozzle is across the mixing-chamber into the suction-passage i in a jet or stream. By opening the valve 71, of the scale-preventive feed-pipe C the compound will drop or flow down into this stream and mixing with the water will be carried to the pump and fed along with the water in the main pressure-pipe a to the boiler or other receiver. The valves L, L, and M are so adjusted that the water will be forced by the pump into the suction-passage i only so fast as it can be drawn through the suction-pipe by the pump, so as to thereby prevent the water from collecting in the mixing-chamber. The needle-valve M enables a nicety of regulation after the flow through the pressure-pipe is roughly regulated by means of the globevalve L. These valves and the valve of the scale-preventive feed-pipe C are adjusted to secure the desired proportions of water and compound and the quantity of the mixture suited to the re uirements of the boiler being fed, and the va ve L of the scution-pipe is adjusted according to the discharge of mixed water needle-valve M.

and compound to prevent the mixture from backing up in the mixing-chamber. By closingboth valves L and L the scale-preventive-feeding apparatus can be cut off from the pumping system or rendered inactive.

The miXing-chamber constructed and arranged as described enables the operator to see at all times just how the apparatus is working. Not only the quantity of scalepreventive being fed, but also the quantity of Water passing into and out of the mixingchamber, can be seen and regulated to insure the most satisfactory and economical operation of the apparatus. Furthermore, by

means of the small nozzle k projecting a fine stream of water directly into the large open suction-passage it is possible to prevent the mixture from scattering and collecting in the mixing-chamber, and thereby hiding or ob- P represents an ordinary check-valve in the suction-pipe E to prevent back pressure into the apparatus, and Q, represents a strainer or filter for mtercepting solid particles in the water to prevent them fromreaching and cutting out or obstructing the The strainer shown consists of a series of fine-Wire screens g, confined in a casing g and separatedby washers or rings g Any other suitable strainer could be employed.

While the apparatus is particularly designed for feeding scale-preventives into boilers with the feed-water, it could also be employed for similarly feeding substances into other receivers subject to internal pressure. Means other than a pump could also be employed for forcing the water into the I mixingchamber and drawing it from the same by suction. Y We claim as our invention' 1. The combination of a mixing-chamber having a transparent portion affording a view of the interior thereof, an inwardlydirected nozzle at one side between its ends and an outlet-passage in the opposite side in line with said nozzle, said outlet-passage being of larger diameter than said nozzle and smaller than said chamber a holder for feeding a scale-preventive into said mixingchamber, and means for projecting a stream of Water from said nozzle across said chamber into said outlet-passage and exhausting the Water from said outlet-passage, substantially as set forth.

2. The combination of a mixing-chamber having a transparent portion affording a tangential nozzle at one side thereof between view of the interior thereof, an inwardlydirected nozzle at one side between its ends connected to the discharge of a pump, and an outlet-passage in the opposite side in line with said nozzle and connected to the suction I of the pump, said outlet-passage being of larger diameter than said nozzle and smaller 1 than said chamber, and a holder for feeding a scale-preventive into said mixing chamber, substantially as set forth.

3. The combination of a mixing-chamber having a cylindrical body, a transparent panel in one or both ends, an inwardly-directed the ends, and a tangential outlet-passage op posite to said nozzle, a holder for feeding a scale-preventive into said mixing-chamber, and means for discharging water from said nozzle into said mixing-chamber and exhausting the water from said outlet-passage, substantially as set forth.

4. The combination of a mixing-chamber having a transparent portion affording a View of the interior thereof, an inwardly-directed nozzle at one side between its ends and an outlet-passage in the opposite side in line with said nozzle, said outlet-passage being of larger diameter than said nozzle and smaller than said chamber, a holder for feeding a scale-preventive into said mixing-chamber, means for projecting a stream of water from said nozzle across said chamber into said outlet-passage and exhausting the water from said outlet-passage, and means for regulating the feed of the scale-preventive and the flow of the water, substantially as set forth.

5. The combination of a mixing-chamber having a transparent portion affording a view of the interior thereof, an inwardlydirected nozzle at one side between its ends and an outlet-passage in the opposite side in line with said nozzle, said outlet-passage being of larger diameter than said nozzle and smaller than said chamber, a holder for feeding a scale-preventive into said mixingchamber, means for projecting a stream of water from said nozzle across said chamber into said outlet-passage and exhausting the water from said outlet-passage, means for regulating the feed of the scale-preventive and the flow of the water, and an air-vent valve for said mixing-chamber, substantially as set forth.

Witness our hands this 14th day of March, 1906.

EDWVARD C. SCHWINGEL. RALPH W'. TURNER.

WVitne'sses F. V. DANFORTH, CHARLES W. PARKER. 

